Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 60bd616440199c8b…

MALICIOUS

Office (OOXML) / .XLSX

629.6 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300
MD5: e5bb99986009f9a0ceb469025863360c SHA-1: d78733b1b1af730b5f3f4e12f8f668456459a25e SHA-256: 60bd616440199c8b176b4de4b52f1971bb6610c0120325f8ce008228425a59a1
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, with a declared inner size significantly larger than the stream size, suggesting a potential exploit. This points to the exploitation of a vulnerability within the Equation Editor to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/dhvld.aU contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
985a765bb6df9af2653445e4b2309716ac676a36b9cc94077235ee49ca7e207f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/dhvld.aU 913408 bytes
ooxml_oleobject_00_ole10native_00.bin
9fc9396a12a968a72b01760d16f1309941b3bc0c746158f6f68369438a3ae3dc		 ole-package OOXML xl/embeddings/dhvld.aU Ole10Native stream: olE10naTIvE 903723 bytes

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